The Effect of BITS Intelligent Signals and Coordinated Intersections on Traffic and Environmental Variables (Case Study: Yazd)

In order to reduce the adverse effects of intersections, intelligent systems and the alignment of lights can be used. The BITS system is a localized version of SCATS and SCOOT systems. The aim of this study was to evaluate of BITS system on traffic and environmental variables. The system was evaluated in both cases of coordinated and isolated signals. Traffic variables include line length, delay time, stop time, travel time, and average speed. Environmental variables include fuel consumption, air pollution caused by carbon monoxide, hydrocarbons, and nitrogen oxides, and noise pollution. Prescheduled, intelligent, and coordinated control systems were compared by collecting field data on the traffic flow rate, travel time, and air and noise pollution and simulation in AIMSUN software in three four-way and two three-way intersections in Yazd, Iran. The results showed that all variables were significantly improved in the isolated intelligent control system compared to the isolated prescheduled control system, and the coordinated prescheduled control system performed better than the isolated prescheduled control system. The isolated intelligent control system showed the best traffic and environmental performance. In addition, line length and stop time were the most affected. Compared to other variables, these two could mostly be measured through drivers’ perceptions. According to the above, using BITS intelligent traffic signals and coordinating nearby intersections – the green wave in successive intersections – can prevent the waste of time and national resources. More immediate effects are reduced air and noise pollution, and reduced delay.

Article Type:
Research/Original Article
Road journal, No. 100, 2019
45 - 62  
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